Debian GNU/Linux 11 syzkaller ttyS0 syzkaller login: [ 32.269106] BUG: Bad rss-counter state mm:000000006272ae1d type:MM_FILEPAGES val:33 [ 32.270692] BUG: Bad rss-counter state mm:000000006272ae1d type:MM_ANONPAGES val:22 [ 32.445246] ================================================================== [ 32.446164] BUG: KASAN: slab-use-after-free in vma_interval_tree_remove+0xc75/0xec0 [ 32.447104] Read of size 8 at addr ffff88800fbbe798 by task sshd/219 [ 32.447865] [ 32.448084] CPU: 0 PID: 219 Comm: sshd Not tainted 6.4.0-rc7-next-20230619 #1 [ 32.449052] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 32.450017] Call Trace: [ 32.450337] [ 32.450623] dump_stack_lvl+0x91/0xf0 [ 32.451111] print_report+0xcc/0x620 [ 32.451598] ? __virt_addr_valid+0x102/0x340 [ 32.452145] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.452795] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.453409] kasan_report+0xbe/0xf0 [ 32.453884] ? vma_interval_tree_remove+0xc75/0xec0 [ 32.454492] vma_interval_tree_remove+0xc75/0xec0 [ 32.455093] vma_prepare+0xc54/0x11a0 [ 32.455567] __split_vma+0x5af/0x950 [ 32.456037] ? __pfx___split_vma+0x10/0x10 [ 32.456569] ? find_held_lock+0x2c/0x110 [ 32.457091] do_vmi_align_munmap+0x2ba/0x11f0 [ 32.457652] ? lock_is_held_type+0x9f/0x120 [ 32.458195] ? __pfx_do_vmi_align_munmap+0x10/0x10 [ 32.458801] ? mtree_range_walk+0x632/0x900 [ 32.459351] ? mas_walk+0x5c7/0x7c0 [ 32.459829] do_vmi_munmap+0x1f1/0x2b0 [ 32.460320] mmap_region+0x1f9/0x2660 [ 32.460824] ? vm_mmap_pgoff+0x15c/0x3a0 [ 32.461334] ? __pfx_arch_get_unmapped_area_topdown+0x10/0x10 [ 32.462048] ? __pfx_lock_acquire+0x10/0x10 [ 32.462577] ? __pfx_mmap_region+0x10/0x10 [ 32.463107] ? security_mmap_addr+0x7d/0xa0 [ 32.463634] ? get_unmapped_area+0x1f5/0x3f0 [ 32.464183] do_mmap+0x854/0xf00 [ 32.464629] vm_mmap_pgoff+0x1a6/0x3a0 [ 32.465124] ? __pfx_vm_mmap_pgoff+0x10/0x10 [ 32.465698] ksys_mmap_pgoff+0x3af/0x500 [ 32.466209] do_syscall_64+0x3f/0x90 [ 32.466691] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.467334] RIP: 0033:0x7fdca2163d82 [ 32.467789] Code: eb aa 66 0f 1f 44 00 00 41 f7 c1 ff 0f 00 00 75 27 55 48 89 fd 53 89 cb 48 85 ff 74 33 41 89 da 48 89 ef b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 56 5b 5d c3 0f 1f 00 c7 05 ae 03 01 00 16 00 [ 32.469918] RSP: 002b:00007fff7453da58 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 [ 32.470819] RAX: ffffffffffffffda RBX: 0000000000000812 RCX: 00007fdca2163d82 [ 32.471660] RDX: 0000000000000005 RSI: 0000000000001000 RDI: 00007fdca159d000 [ 32.472526] RBP: 00007fdca159d000 R08: 0000000000000009 R09: 0000000000001000 [ 32.473379] R10: 0000000000000812 R11: 0000000000000206 R12: 0000557b2f622ec0 [ 32.474222] R13: 00007fff7453da70 R14: 00007fff7453daa0 R15: 00007fff7453de00 [ 32.475093] [ 32.475381] [ 32.475596] Allocated by task 212: [ 32.476029] kasan_save_stack+0x22/0x50 [ 32.476542] kasan_set_track+0x25/0x30 [ 32.477034] __kasan_slab_alloc+0x59/0x70 [ 32.477560] kmem_cache_alloc+0x16b/0x370 [ 32.478078] vm_area_dup+0x20/0x160 [ 32.478533] __split_vma+0x170/0x950 [ 32.479002] split_vma+0xc6/0x110 [ 32.479439] mprotect_fixup+0x8d2/0xb30 [ 32.479939] do_mprotect_pkey+0x87e/0xd40 [ 32.480465] __x64_sys_mprotect+0x78/0xc0 [ 32.480996] do_syscall_64+0x3f/0x90 [ 32.481464] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.482111] [ 32.482326] Freed by task 212: [ 32.482719] kasan_save_stack+0x22/0x50 [ 32.483221] kasan_set_track+0x25/0x30 [ 32.483716] kasan_save_free_info+0x2b/0x50 [ 32.484261] __kasan_slab_free+0x10a/0x190 [ 32.484815] kmem_cache_free+0x10d/0x4d0 [ 32.485327] rcu_core+0x8c8/0x2860 [ 32.485767] __do_softirq+0x1b7/0x7d4 [ 32.486240] [ 32.486458] Last potentially related work creation: [ 32.487042] kasan_save_stack+0x22/0x50 [ 32.487541] __kasan_record_aux_stack+0x8e/0xa0 [ 32.488119] __call_rcu_common.constprop.0+0x6a/0xb90 [ 32.488765] remove_vma+0x139/0x170 [ 32.489213] do_vmi_align_munmap+0xd4a/0x11f0 [ 32.489766] do_vmi_munmap+0x1f1/0x2b0 [ 32.490254] __vm_munmap+0x138/0x3a0 [ 32.490718] __x64_sys_munmap+0x59/0x80 [ 32.491218] do_syscall_64+0x3f/0x90 [ 32.491692] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 32.492327] [ 32.492555] The buggy address belongs to the object at ffff88800fbbe740 [ 32.492555] which belongs to the cache vm_area_struct of size 168 [ 32.494035] The buggy address is located 88 bytes inside of [ 32.494035] freed 168-byte region [ffff88800fbbe740, ffff88800fbbe7e8) [ 32.495448] [ 32.495666] The buggy address belongs to the physical page: [ 32.496321] page:00000000873ebe99 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xfbbe [ 32.497424] memcg:ffff88800d18ef01 [ 32.497849] anon flags: 0x100000000000200(slab|node=0|zone=1) [ 32.498544] page_type: 0xffffffff() [ 32.498992] raw: 0100000000000200 ffff88800879fc80 0000000000000000 dead000000000001 [ 32.499909] raw: 0000000000000000 0000000000110011 00000001ffffffff ffff88800d18ef01 [ 32.500815] page dumped because: kasan: bad access detected [ 32.501478] [ 32.501692] Memory state around the buggy address: [ 32.502273] ffff88800fbbe680: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 32.503131] ffff88800fbbe700: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb [ 32.503982] >ffff88800fbbe780: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc [ 32.504839] ^ [ 32.505338] ffff88800fbbe800: fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb fb [ 32.506199] ffff88800fbbe880: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc [ 32.507048] ================================================================== [ 32.508148] Disabling lock debugging due to kernel taint [ 34.382043] BUG: Bad rss-counter state mm:0000000039c24a1d type:MM_FILEPAGES val:33 [ 34.382981] BUG: Bad rss-counter state mm:0000000039c24a1d type:MM_ANONPAGES val:22 [ 34.864822] BUG: Bad rss-counter state mm:0000000067e0a923 type:MM_FILEPAGES val:33 [ 34.865744] BUG: Bad rss-counter state mm:0000000067e0a923 type:MM_ANONPAGES val:22 Warning: Permanently added '[localhost]:13049' (ECDSA) to the list of known hosts. 2023/06/20 00:48:24 fuzzer started 2023/06/20 00:48:25 dialing manager at localhost:44161 2023/06/20 00:48:25 checking machine... 2023/06/20 00:48:25 checking revisions... [ 35.611499] kmemleak: Automatic memory scanning thread ended 2023/06/20 00:48:25 testing simple program... [ 35.667149] cgroup: Unknown subsys name 'net' [ 35.732620] cgroup: Unknown subsys name 'rlimit' executing program executing program executing program VM DIAGNOSIS: 00:48:23 Registers: info registers vcpu 0 RAX=0000000000000000 RBX=0000000000000000 RCX=ffffffff818c259a RDX=ffff888015898000 RSI=00007f9174000b88 RDI=00007f9174000b80 RBP=00007f9174000b88 RSP=ffff888016a5f950 R8 =0000000000000007 R9 =0000000000000000 R10=00007f9174000b88 R11=0000000000000000 R12=0000000000000001 R13=ffff88800ca54780 R14=0000000000000041 R15=00007f9174000b80 RIP=ffffffff814c02f8 RFL=00000293 [--S-A-C] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007f917b57a700 00000000 00000000 GS =0000 ffff88806ce00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe0000003000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000001000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007f250d78ebd0 CR3=000000000fb18000 CR4=00350ef0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=38343a3030203032206e754a3e38333c XMM01=656e6e6f637369642064657669656365 XMM02=63736964203a31313a30363038332074 XMM03=66207463656e6e6f6373696420646576 XMM04=6456774875434142334f726f59427469 XMM05=485320415352203a3268737320303630 XMM06=206d6f726620746f6f7220726f662079 XMM07=00000000000000000000000000000000 XMM08=3a677562656420676f6c737973720000 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000 info registers vcpu 1 RAX=0000000000000001 RBX=ffffffff813ad420 RCX=0000000000000001 RDX=ffff888018dff6b8 RSI=ffff888018dff680 RDI=ffff88806cf09a80 RBP=ffff88806cf09b08 RSP=ffff88806cf09a50 R8 =0000000000000001 R9 =ffff88806cf09ab0 R10=0000000000038001 R11=000000000008b5ce R12=ffff88806cf09b38 R13=ffff88806cf09ab8 R14=ffff888018dff680 R15=ffff88806cf09a70 RIP=ffffffff81130933 RFL=00000282 [--S----] CPL=0 II=0 A20=1 SMM=0 HLT=0 ES =0000 0000000000000000 00000000 00000000 CS =0010 0000000000000000 ffffffff 00a09b00 DPL=0 CS64 [-RA] SS =0018 0000000000000000 ffffffff 00c09300 DPL=0 DS [-WA] DS =0000 0000000000000000 00000000 00000000 FS =0000 00007f29fac5d900 00000000 00000000 GS =0000 ffff88806cf00000 00000000 00000000 LDT=0000 fffffe0000000000 00000000 00000000 TR =0040 fffffe000004a000 00004087 00008b00 DPL=0 TSS64-busy GDT= fffffe0000048000 0000007f IDT= fffffe0000000000 00000fff CR0=80050033 CR2=00007ffcfb21d000 CR3=0000000018c80000 CR4=00350ee0 DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 DR3=0000000000000000 DR6=00000000ffff0ff0 DR7=0000000000000400 EFER=0000000000000d01 FCW=037f FSW=0000 [ST=0] FTW=00 MXCSR=00001f80 FPR0=0000000000000000 0000 FPR1=0000000000000000 0000 FPR2=0000000000000000 0000 FPR3=0000000000000000 0000 FPR4=0000000000000000 0000 FPR5=0000000000000000 0000 FPR6=0000000000000000 0000 FPR7=0000000000000000 0000 XMM00=00000000000000000000000000000000 XMM01=74696d7265705f6d61703d73726f746e XMM02=000000000000000000000000000000ff XMM03=5320444f4854454d5f54505952434e45 XMM04=40404040404040404040404040404040 XMM05=5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a5a XMM06=20202020202020202020202020202020 XMM07=00000000000000000000000000000000 XMM08=61662029286e65706f5f746964756100 XMM09=00000000000000000000000000000000 XMM10=00000000000000000000000000000000 XMM11=00000000000000000000000000000000 XMM12=00000000000000000000000000000000 XMM13=00000000000000000000000000000000 XMM14=00000000000000000000000000000000 XMM15=00000000000000000000000000000000